US3460766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock breaking method and apparatus
Assignee: SMALL BUSINESS ADMINISTRATION
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Filing: 1966-06-13
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Granted: 1969-08-12
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Expires: 1986-06-13
Abstract
No abstract record available.
Inventors
- 👤 Erich Sarapuu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:13
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/18; B02C2019/183
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PROCESS IN AID OF FRACTURING ROCKS COMPRISING CONTACTING TWO SPACED APART ZONES OF A ROCK MASS WITH A PAIR OF RELATIVELY LARGE YET LIMITED AREA MULTI-POINT CONTACT ELECTRODES AGAINST THE ROCK WITHIN SAID AREA AND FLOWING SUFFICIENT ELECTRICAL POWER INTO SAID ROCK TO EFFECT HEATING OF A PLURALITY OF INTERNAL CHANNELS OF RELATIVELY HIGH CONDUCTIVITY IN SAID ROCK, THEREBY CREATING A MULTIPLICITY OF THERMAL STRESSES WITHIN SAID ROCK.
Claim 2
Dependent Claim
69 words
A PROCESS IN AID OF FRACTURING ROCKS COMPRISING CONTACTING TWO SPACED APART ZONES OF A ROCK MASS WITH A PAIR OF RELATIVELY LARGE YET LIMITED AREA MULTI-POINT CONTACT ELECTRODES AGAINST THE ROCK WITHIN SAID AREA AND FLOWING SUFFICIENT ELECTRICAL POWER INTO SAID ROCK TO EFFECT HEATING OF A PLURALITY OF INTERNAL CHANNELS OF RELATIVELY HIGH CONDUCTIVITY IN SAID ROCK, THEREBY CREATING A MULTIPLICITY OF THERMAL STRESSES WITHIN SAID ROCK.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-11 | 1973-02-10 | 1973-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-11 | 1977-02-10 | 1977-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-11 | 1981-02-10 | 1981-08-12 | $7700.00 | Window Closed / Lapsed |